Boiler feed check valve



Sept. 3, 1940.

R. F. DAVIS ET AL BOILER FEED CHECK VALVE Filed March 8. 1937 fwdPatented Sept. 3, 1 940 UNITED STATES 2,213,487 v M BOILER FEED CHECKvALvE a Reuben F.-Davis, Kirby T. Penick,and Arthur p Penick, Houston,Tex; said Davis assignor to v Kirby T. Penick and Arthur J. Penicl;Application March 8, 1937', Serial No. 129,550

This invention relates to a check valve for combination boiler feedcheck and stop valve mechanism; An object of the...inve,ntion is toprovide a 5 check'valvein a uhitary construction of the characterdescribed, which is specially appliable to the feed water pipe of aboiler whereby water may be fed to the boiler as required to maintainthe proper water level and whereby the back- 10 flow of water or steamfrom the boiler will be prevented, with a stop 'valve embodied in theconstruction whereby the feed water pipe may be completely closed.

It is a further object of the invention to pro- 15 vide valve mechanismof the character described wherein the check valve casing and stop valvecasing are formed as a unitary structure.

It is a further object of the invention to provide in a combined valvemechanism of the char- 20 acter described a novel assembly of valve seatand valve cage mounted in the check valve casing in a novel mannerwhereby the parts are rendered readily accessible for repairs andreplacements.

The invention embodies certain improvements over that type of boilerfeed check valve described in our co -pending application executed ofeven date herewith.

With the above and other objects in view the 30 invention has particularrelation to certain novel features of construction, operation andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawing wherein:

Figure 1 shows a sectional view taken on the line l-l of Figure 2.

Figure 2 shows a sectional view taken on the line 2-2 of Figure 1 andFigure 3 shows a plan view of the valve mechanism as mounted in thewater feed pipe of a boiler, showing also the boiler, pumps andconnections. I

Referring now more particularly to the drawing wherein like numerals ofreference designate the same parts in each of the figures, the numeral ldesignates the check valve casingl which is cylindrical in form and hasthe inlet connection 2 to which the feed pipe 3 is'connected. The feedpipe 3 leads from the manifold 4 which in turn is connected with thepumps 5 by means 50 of the delivery pipe 6. The valve casing I has aninside annular shoulder 1 on which the external rib 8 of the annularvalve seat 9 rests. The flow of liquid through the seat 9 is controlledby the upwardly opening ball valve [0 55 which is confined by the valvecage II. This 2 Claims; .(01. 251-12 1) cage is of openworlg"construction as shown-in Figure 1 and its lower end surrounds the valveseat and rests' on the-rib '8. The crown of the cage llfisi foi I wardlyextending projection 12. Y

Screwed into the upper end of the casing l is the crown plug l3 which isconcavo-convex in general contour and whose under side is formed toconform to the shape of and to fit closely against the projection I2whereby the cage and valve seat are clamped securely in place.

The upper end of the crown plug is formed with medwith a conical shaipedup an extension Hi to receive a wrench whereby the plug may be screwedinto place or unscrewed.

Screwed into the upper end of the casing Formed integrally with one sideof thecasing I there is a cylindrical stop valve casing I! having theconnection I8 and leading from this connection there is a pipe l9 whichenters the boiler. 1

Within the stop valve casing and aligned with the connection l8 there isa valve seat 20.

A bonnet 2| is screwed into the stop valve casing I! in alignment withbut spaced from the seat 20. This bonnet contains a stuffing boxcomprising the packing 22 and the gland 23, abutting the outer end ofthe packing and retained in place by the cap screw 24 which is screwedonto the bonnet and abuts the outer end of the gland. A valve stem 25extends axially through said stuffing box and bonnet and has a handwheel 26 on the outer end thereof. The stem 25 has athreaded connectionwith the bonnet and a swivel connection with the tapered stop valve 2!which is mounted on the inner end thereof in any suitable manner. Thecasings I and l! are connected by a passageway 28 leading from theformer into the latter.

Normally the stop valve 2'! will be in open position and upon operationof the pumps 5 water will be forced into the manifold 4 and thencethrough the pipe 3 past the valve l0 and through the passageway 28 intothe casing l1 and thence out through the seat 20 and through the pipe l9into the boiler. When the pumps are stopped the check valve Ill willseat to prevent the back-flow of water or steam.

If for any reason it should be desired to close the pipe ill, the stem25 may be appropriately valve mechanism; a check valve comprising atubular casing having an inlet connection at one end and a lateralopening, an annular valve seatin the casing between the connection andopening, a valve on said seat, a valve cage on the seat limiting therange of movement of the valve,

a projection on the cage, a crown plug screwed into the end of thecasing opposite said connection and having a concave-convex contour andwhose central portion of the underside is formed to conform to the shapeof and to fit.

closely against said projection, the outer end of the crown plug beingformed with an extension projecting. beyond the casing and adapted toreceive a wrench and a cap screwed into the end turned to seat the valve21 against the seat 20;

of the casing and spaced from the crown plug.

2. In a combination boiler feed check and stop valve mechanism; a checkvalve comprising a tubular casing having an inlet connection at one endand a lateral opening, an annular valve seat in the casing between theconnection and opening, a ball valve on said seat, a valve cage having aclosed end and an openend, said open end positioned on the seat andtheclosed end limiting the range of movementof the valve, a projectionon the closed end of the cage and located on the longitudinal axis ofsaid cage, a crown. plug screwed into the end of the casing opposite thesaid connection having a concavoconvex contour and whose undersidecentral portion is formed to conform to the shape of and to fit closelyagainst said projection, the outer end of the crown plug being formedwith an out- Wardly projecting extension adapted to receive a wrench anda cap screwed into, the end of the casing and spaced from the crownplug, said crown plug having a duct therethrough.

" REUBEN F. DAVIS. KIRBY T. PENICK.

' ARTHUR J. PENICK.

